The effects of irrigation on colonization of Pinus sylvestris and Quercus pubescens by members of the Phialocephala fortinii s.l. – Acephala applanata species complex (PAC) was assessed. Roots were collected from an irrigation experiment site. PAC species were identified based on 13 microsatellites. Irrigation and host species had a significant effect on the frequency of roots colonized by PAC. In oak (Q. pubescens) but not in pine (P. sylvestris), PAC were significantly more common on dry non-irrigated plots than on irrigated ones. Frequency of colonization of pine roots was twice as high as that of oak roots, and the mean number of PAC species per tree was significantly higher for pines. A hitherto unknown PAC species was found. The community structure was random except for the most frequently isolated Phialocephala europaea and Phialocephala helvetica, which inhibited one another in pine roots. The possible effects of PAC colonization on drought resistance of oak are discussed.

评估了灌溉对福寿松（Pialocephala fortinii sl – Acephala applanata）物种复合体（PAC）的成员定居在樟子松和栎（Quercus pubescens）的影响。根系从灌溉实验点收集。根据13个微卫星鉴定了PAC物种。灌溉和寄主物种对PAC定殖根系的发生频率有显着影响。在栎（Q。毛竹），但不松（P。樟子松），在干旱的非灌溉地块上，PAC比灌溉的地块更为常见。松树根的定居频率是橡树根的两倍，每棵树的PAC种类的平均数量明显高于松树。发现了迄今未知的PAC种类。群落结构，除了最常见的孤立的随机Phialocephala 油橄榄和Phialocephala Helvetica字体，这抑制了松树根彼此。讨论了PAC定殖对橡木抗旱性的可能影响。